Solve the product (b+10)(b-9)

 Exercise

$\left(b+10\right)\left(b-9\right)$

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Multiply the single term $b-9$ by each term of the polynomial $\left(b+10\right)$

$b\left(b-9\right)+10\left(b-9\right)$

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Multiply the single term $b$ by each term of the polynomial $\left(b-9\right)$

$b\cdot b-9b+10\left(b-9\right)$

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When multiplying two powers that have the same base ($b$), you can add the exponents

$b^2-9b+10\left(b-9\right)$

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Multiply the single term $10$ by each term of the polynomial $\left(b-9\right)$

$b^2-9b+10b-90$

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Combining like terms $-9b$ and $10b$

$b^2+b-90$

$b^2+b-90$

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